Sounds a little more involved than what I'm willing to tackle at this time. I think I'll go with the carbureted setup and I'll keep the stock TBI and intake equipment, should I ever want/need to convert back.

 

Yeah I have been thru the same thing, new double roller timing chain and gears, new distributor, new dual exhaust without converter, (we don't have emmission testing here), all sensors has been replaced, rebuilt throttle body, new PCM, new vacuum hoses, plugs, wires, cap, rotor, coil, EGR valve, I have ran a compression test with 140-150 lbs per cylinder. I have ran 2 cans of mopar combustion chamber cleaner thru it and a can of BG 44K power enhancer. Double checked the throttle cable to make sure it is opening all the way. I have closely monitored the air pressure in the tires and replaced the clutch fan with a thermostatically controlled electric fan that rarely comes on. New fuel filter. It idles as smooth as butter it is not showing any codes. I think it is anemic on power still and the 9-10 MPG is intolerable. I am about ready to burn it!! After torching it I may consider trying going back to a carb. I can rob all the parts I need off my 85 Dodge van, it has a rebuilt carb that is about a year old. What all is involved, do they make an adapter plate for TBI to carb or do you have to change the intake manifold? I guess you have to change the distributor also and I guess I would need the brains from the 85 also huh? Are their websites that give specific instructions on conversion? This will not be a daily driver anymore due to gas prices so a carb does not bother me. I need the power to pull my camper now and then. The way it is, if their is any wind it does well to pull itself. I really am ready to give up on the TBI and go to a carburetor. I am thru messing with the TBI system. Has anyone else done TBI to Carb conversion?

 

i have a 89 d100 (200,000 miles) that i recently converted to a 4 barrel carb. my tbi was stalling really bad, i couldn't even stop at a red light without it stalling out. had it rebuilt 2 times with no luck, then decided that i would tackle the carb job. i was getting about 9 mpg with the tbi, which i figured i cant go much worse with no power. the only thing i didn't take into effect was the fuel pump pumping for fuel injection. the linkage was another pain in the butt, getting that just right. i put on a edelbrock performer intake w/a 600 electric choke. make sure you map your vacuum on this.

i didn't gain alot of power, did gain a bit better gas mileage out of it. use a high end fuel regulator on it with a return line, i used a malory regulator.

no more stalling, haven't gotten it tuned all that well yet, but im getting ready to do a complete tear down, and a high end head job. going to try and pull around 350 to 400 horsies out of this lame and tame motor.

good luck on yours

 

If you are switching to a carb, you might aswell just switch to a 360 while you are at it. The fuel mileage won't be much different and you will get a significant power boost.

 

If you got a little bit of money and a little time, there is a website, i cant think of what it is right now, but they sell a 360 stroked out to a 408, you would get alot of power and get about the same gas mileage you are now, if you tune it right, and if you put a six pack on top of it, all you have to do is have a cut-off to the front two carburetors, and then you can run it with only 1 2bbl, and then open the fuel cutoff and have all 3 2bbl's, but thats just me...